@pasham123 If you have some soldering skill, you could buy the board, programmer, and parts and build one yourself, but it is not very cost effective. This project cost me about $140, not including the programmer. I would recommend it for the learning experience, otherwise, depending on your needs, you could get an old civil defense meter for pretty cheap, or a Geiger counter off someplace like eBay. Another disclaimer: the Geiger tube used in this project is no longer for sale/available.